package org.x.yuenovel.configuration.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;
import org.x.yuenovel.util.JwtTokenUtil;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author Ning Meng
 * @Date 2022/4/22 10:12
 **/

public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    private static final Logger LOGGER = LoggerFactory.getLogger(JwtAuthenticationTokenFilter.class);

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        String authToken = request.getHeader(this.tokenHeader); // 或者保存token的请求头的值
        if (authToken != null) {
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            LOGGER.info("checking username: {}", username);
            if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                if (jwtTokenUtil.validateToken(authToken, userDetails)) {
                    UsernamePasswordAuthenticationToken authentication =
                            new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    LOGGER.info("authenticationToken: {}", authentication);
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
        }

        filterChain.doFilter(request, response);
    }
}
